JPH06312255A - Method for supplying ingot into metal melting furnace - Google Patents

Abstract

PURPOSE:To make the forming work efficient and to contrive saving by charging and melting a held long ingot in multi-steps according to consumption of molten metal by die casting formation. CONSTITUTION:The ingot 13 is supplied into a metal melting furnace 1 for melting the metal, supplied into a die for die casting formation. Then the long ingot 13 held with a chuck 22 as a holding member is charged and melted into the metal melting furnace 1 in multi-steps according to the consumption of the molten metal by the die casting formation. The ingot 13 is supplied into the melting furnace 1 from a conveying device 31 with an ingot supplying device 3 through the holding member 22. By this method, the product having stable quality can be formed by the die casting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying an ingot to a metal melting furnace for melting an ingot of a metal such as aluminum, zinc and brass during die casting.

[0002]

2. Description of the Related Art When die-casting a metal material, a predetermined amount of molten metal (hereinafter referred to as "hot water") is taken out from a metal melting furnace that melts a metal ingot, and a pair of die-casting machines (hereinafter referred to as "forming machines") are used. The product is molded by press-fitting into the mold.

During the above-mentioned forming operation, the operator sequentially visually confirms the remaining amount of the hot water in the metal melting furnace, and when the remaining amount becomes small, the operator puts an ingot into the melting and melts it. Are replenished by.

[0004]

However, when the ingot is supplied and melted by the above-mentioned method, the operator must constantly check the remaining amount of hot water in the metal melting furnace between the work and the hot water. When the remaining amount of the water became low, an ingot commensurate with the amount of hot water consumed had to be put in, and the workability was extremely poor. In particular, the work environment and the safety were poor because the temperature around the metal melting furnace became high and the working environment was bad.

Further, when a large number of ingots corresponding to the amount of consumed hot water are thrown in at one time and replenished, the hot water temperature of the metal melting furnace is greatly lowered. In this case, the temperature history (hysteresis) of the hot water in the metal melting furnace becomes non-uniform, so when the product is molded with hot water having different temperature history, the metal characteristics of the product become non-uniform and It has a problem of quality variation.

[0006]

In order to solve the above-mentioned conventional drawbacks, the present invention provides a method for supplying an ingot to a metal melting furnace for melting a metal supplied to a die-cast molding die. A feature of the present invention is that the held long ingot is charged into the furnace in multiple stages according to the consumption amount of the molten metal by the die-cast molding and melted.

[0007]

Since the present invention is constructed as described above,
When the hot water in the metal melting furnace is consumed by the die-cast molding, the held long metal ingot is gradually poured into the hot water of the metal melting furnace according to the amount of hot water consumed by the molding. Dissolve.

As a result, the remaining amount of the hot water in the metal melting furnace can be kept substantially constant, and the temperature change of the hot water due to the melting of the ingot can be minimized.

[0009]

EXAMPLES The method of the present invention will be described below with reference to examples in which an aluminum melting furnace is used.

The aluminum melting furnace 1 is constructed to heat aluminum, for example, to a temperature at which it can be melted by a built-in heater and to keep the molten state of aluminum. A molding machine (not shown) is disposed on the side of the aluminum melting furnace 1, and the molding machine clamps the molten aluminum (aluminum hot water) supplied from the aluminum melting furnace 1 into a movable mold and a fixed mold. A product having a predetermined shape is molded by being pressed into the molding space with the mold.

The molding machine outputs a molding completion signal to the control device of the ingot supply device, which will be described later, when the movable mold is opened along with the removal of the product.

An ingot feeder 3 is arranged between the aluminum melting furnace 1 and a carry-in device 31 described later. A main body frame 5 of the ingot feeder 3 extends in a horizontal direction, and a first feed screw connected to a first electric motor 7 attached to the main body frame 5 having an axis line in the horizontal direction in the main body frame 5. 9 is rotatably supported.

A horizontal traveling body 11 is attached to the body frame 5.
Is movably supported in the horizontal direction, and a first feed screw 9 is meshed with a nut (not shown) of the horizontal traveling body 11. Then, the horizontal traveling body 11 is moved between the take-out position and the supply position of the aluminum ingot 13 by the first feed screw 9 which rotates in accordance with the driving of the first electric motor 7.

A vertical frame 15 is attached to the horizontal traveling body 11, and the vertical frame 15 has an axis in the vertical direction and is connected to a second electric motor 17 which is mounted on the upper and lower frames 15 and which can be controlled numerically. The second feed screw 19 is rotatably supported. An up-and-down traveling body 21 is supported on the up-and-down frame 15 so as to be movable in the up-and-down direction, and a second feed screw 19 is meshed with a nut (not shown) of the up-and-down traveling body 21. And the vertical traveling body 2
1 is moved in the up-down direction as the second electric motor 17 is driven.

A chuck 22 as a holding member is attached to the vertical traveling body 21. The support arm 23 of the chuck 22 is formed in an L-shape that extends to the left as shown in FIG. 2 and then hangs down. A holding arm 25 is rotatably supported at the tip of the support arm 23. Holding arm 2
A rod of a sandwiching cylinder 27, whose base end is attached to the vertical traveling body 21, is connected to the upper end of the sandwiching cylinder 5, and the sandwiching arm 25 is opened and closed by the operation of the sandwiching cylinder 27.

An uneven portion 23a for preventing sliding is attached to the hanging wall surface of the support arm 23 facing the holding arm 25, and a piercing body 29 is attached to the side surface of the holding arm 25 facing the uneven portion 23a. There is.

A carry-in device 31 is arranged on the right side of the main body frame 5 shown in FIGS. A supporting disc 35 is rotatably supported on a frame 33 of the carry-in device 31, and a numerically controllable third electric motor 39 attached to the frame 33 is connected to a boss 37 of the supporting disc 35. . With the intermittent drive of the third electric motor 39, the supporting disk 35 is rotated at a predetermined angle that matches the arrangement interval between the support frames 41 described later.

A plurality of support frames 41 are attached to the upper surface of the support disk 35 on the outer peripheral side at predetermined intervals in the circumferential direction, and the lower portions of the vertically elongated aluminum ingots 13 to be melted are inserted into the respective support frames 41. Is held. The aluminum ingot 13 supported by the support frame 41 is set such that the upper portion thereof substantially coincides with the lower limit position of the vertical traveling body 21.

Next, the method of supplying the aluminum ingot 13 will be described. The aluminum ingot 13 put into the aluminum melting furnace 1 is melted and then kept in a molten state. Further, as shown in FIG. 2, the horizontal traveling body 11 is moved to the left and the vertical traveling body 21 is moved upward. The aluminum ingot 13 whose upper end is sandwiched between the hanging wall of the support arm 23 and the piercing body 29 of the sandwiching arm 25 by the sandwiching cylinder 27 operated in this state has a lower end as shown in FIG. It is located slightly above the molten metal level in the aluminum melting furnace 1.

When the molten metal in the aluminum melting furnace 1 is taken out and consumed in the molding operation, the molten metal surface in the aluminum melting furnace 1 is gradually lowered. Further, when the movable mold is opened with taking out the product after molding, the control device of the ingot supply device 3 causes a counter circuit (neither is shown) based on the molding end signal from the control device of the molding machine. Is incremented to measure the number of moldings, and accordingly the amount of hot water consumed.

Then, when the number of forming times counted by the counter circuit reaches a preset predetermined number, the controller of the ingot feeder 3 drives the second electric motor 17 by a predetermined number of steps as shown in FIG. It is controlled to move the vertical traveling body 21 downward by a predetermined distance (this predetermined distance is set according to the vertical length of the aluminum ingot corresponding to the amount of hot water consumed) and is held by the chuck 22. A part of the aluminum ingot 13 is put into the hot water of the aluminum melting furnace 1 and melted. Thereby, the molten metal surface of the aluminum melting furnace 1 is returned to the initial state.

Similar to the above operation, the control device of the ingot supply device 3 sequentially moves the vertical traveling body 21 by a predetermined distance every time the number of molding times of the product reaches a predetermined number, and the aluminum ingot held by the chuck 22. 13 is sequentially poured into the molten metal of the aluminum melting furnace 1 and melted.

When the up-and-down traveling body 21 is moved to the lowermost position as the up-and-down traveling body 21 is sequentially moved, as shown in FIG.
As shown in FIG. 3, the control device of the ingot supply device 3 moves the holding cylinder 27 back to release the holding of the aluminum ingot 13 by the holding arm 25, so that the remaining aluminum ingot 13 is placed in the hot water of the aluminum melting furnace 1. Charge and dissolve.

After the above operation, the control device of the aluminum supply device 3 drives and controls the first electric motor 7 to return the horizontal traveling body 11 to the original position shown in FIG. At this time, the chuck 22 is positioned above the support frame 41 from which the aluminum ingot 13 melted by the above-mentioned operation is taken out. Next, as shown in FIG. 5, in the above state, the control device intermittently drives the third electric motor 39 to rotate the supporting disk 35 by a predetermined angle, thereby separating the supporting arm 23 of the chuck 22 and the holding arm 25. After the upper end of the aluminum ingot 13 to be melted next is positioned in between, the clamping cylinder 2
7, the upper end of the aluminum ingot 13 is clamped, and then the second electric motor 17 is driven to drive the vertical traveling body 2
1 is moved to the upper limit position of the upper and lower frames 15. As a result, the aluminum ingot 13 held by the chuck 22 is held.
Are taken out from the support frame 41.

Then, the control device of the ingot supply device 3 drives the first electric motor 7 to move the horizontal traveling body 11 to the left limit position of the supply device 3 and then newly clamps it in the same manner as the above-mentioned operation. The formed aluminum ingot 13 is gradually poured into the molten metal of the aluminum melting furnace 1 and melted in accordance with the number of moldings, that is, the amount of molten metal consumed in the aluminum melting furnace 1.

As described above, according to the method of this embodiment, the work of checking the amount of hot water consumed by the worker and the work of charging the aluminum ingot 13 can be eliminated to save the labor and the efficiency of the work for melting the ingot. Further, instead of letting the aluminum ingot 13 into the hot water of the aluminum melting furnace 1 at once,
Since it is gradually charged, it can be melted with a minimum change in the temperature of the hot water, and it is possible to mold the product with high quality by reducing the variation in the temperature history of the hot water.

In the above description, the second electric motor 17 is numerically controlled to gradually move the vertical traveling body 21 so that the aluminum ingot 13 is sequentially charged into the molten metal of the aluminum melting furnace 1 to melt the aluminum ingot 13. However, a limit switch is attached to each predetermined position of the upper and lower frames 15, and the second electric motor 17 is stopped and controlled when each limit switch is turned ON or OFF as the vertical traveling body 21 moves. A method may be used in which the aluminum ingot 13 is sequentially charged into the hot water of the aluminum melting furnace 1 and melted. In addition, as a drive member of the horizontal traveling body 11, the first
Although the electric motor 7 and the second electric motor as the vertical driving member of the vertical traveling body 21 are used, it goes without saying that a cylinder may be used.

Further, in the loading device 31 described above, a large number of support frames 41 are attached to the upper surface of the outer circumference of the supporting disk 35, and the aluminum ingot 13 to be melted by intermittently rotating the supporting disk 35 is held. Although the support frame 41 is rotated to a predetermined take-out position, the carrying-in device may be of a conveyor type. That is, by mounting a number of support frames 41 on the conveyor belt of the conveyor at the same pitch with respect to the conveyor direction and controlling the conveyor to be intermittently driven, the aluminum ingot 13 to be melted is sequentially moved to a predetermined take-out position. Can be made.

Further, although the above description has been made on the aluminum melting furnace of the crucible furnace, the present invention can be carried out as a feeding method when feeding the ingot to the continuous melting furnace which continuously feeds the hot water.

[0030]

Therefore, according to the present invention, it is possible to improve the efficiency and labor saving of the forming work by eliminating the work of checking the remaining amount of hot water and the work of inserting the ingot by the operator.

Further, it is possible to reduce the change in the hot water temperature in the metal melting furnace due to the supply of the ingot and to die cast a product of stable quality.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing an example of an apparatus embodying a method of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a partial front view showing an initial state of charging.

FIG. 4 is a partial front view showing a released state.

FIG. 5 is a partial front view showing a state where an aluminum ingot is taken out.

[Explanation of symbols]

 1 Aluminum Melting Furnace as Metal Melting Furnace 3 Ingot Supply Device 13 Aluminum Ingot 22 Chuck as Holding Member

Claims (1)

[Claims] 1. A method for supplying an ingot to a metal melting furnace for melting a metal supplied to a die for die casting, which comprises die casting a long ingot held in a metal melting furnace. An ingot supply method characterized in that the molten metal is charged and melted in multiple stages according to the consumption amount of the molten metal.